Long post
Some of mine are technological and others are a way of life.
Dialup internet - I played the connecting sound one day and my 17 year old son didn't have a clue what that noise was. Took you like a minute or two to open a picture and God help you if you tried to download a video. Definitely sucked for porn. Speaking of porn.....
Porn magazines - Remember the old days when it was like an episode of Mission Impossible trying to sneak out one of your dad's porn mags from his stash? Then you had to make sure you put it back exactly the way you found it. Now any teenager with a phone, tablet, or computer has an unlimited supply at their fingertips.
Kids wanting to play outside - I hated being stuck in the house. At least until the first Nintendo came out. Even then I wanted the freedom to go outside and do what I want. Go ride my Team Murray BMX bike on a path through the woods near my house. Go down to the creek and catch turtles and crawdads. We even had a fun game like hide n seek (called chase) but it was outside and we usually played it in the dark (can't do that these days with all of the weirdos out there). Now hanging out with your friends is being on Xbox Live playing Call of Duty or on FaceTime.
Discipline - When I was a kid and you misbehaved, you got a belt, switch, broom, or whatever was close enough for your parents to grab and swing at you. That doesn't even count the regular old butt whipping with the hand. Also, remember the paddles at school? Now you can get in trouble for spanking your kid and then being accused of child abuse. No, child abuse is not disciplining your kid and then them going through life expecting no consequences for their actions.
Good tasting unhealthy food - There is plenty of it still out there, but if some people have their way we will be eating food like in the movie Demolition Man.
I remember when we had some good food at school. Especially those rectangle sausage pizzas they had. On pizza day I would get 2 lunches because they were so good. Glad I had a part time job to pay for it. Now my kids refuse to eat the food at school and we have to get stuff at the grocery store so they can bring their lunch.
Also remember that idiot that ate McDonald's every meal (seriously, who does that?) for like a month to show it's effect on people and made a documentary about it (Super Size Me)? After the bad publicity, McDonald's took away the super sized fry. I loved me a super sized fry. Let me be the one to decide what I want to eat. Now it is happening everywhere (healthier products) and you actually have to pay more attention at the grocery store so you don't grab something that is fat free, gluten free, sugar free, etc.